High-precision Calculations of Autoionizing States of Nickel Atom for $J^{\pi} = 4^-$ symmetry

The data were generated through a combination of theoretical atomic structure calculations and experimental measurements referenced from published literature (specifically, the experimental works of Shi et al. [1] and Zhang [2]). The theoretical values presented in "This Work" were obtained using relativistic multichannel theory (RMCT) + multichannel quantum defect theory (MQDT) methods, while the comparative "FAC [3]" lifetime data were produced via mean-field calculations performed with the Flexible Atomic Code (FAC).

The dataset is structured in a tabular format containing 20 records, with each row corresponding to a specific atomic energy state. The columns are defined as follows: "States" identifies the quantum mechanical designation of the autoionizing level; "Energy levels" provides the resonance center energies in wavenumbers ($\text{cm}^{-1}$), with sub-columns for the theoretical values from this study and the experimental values from the cited references; and "Lifetime (ps)" gives the calculated lifetimes in picoseconds (ps), comparing the results from this work with those from the FAC code.